From: Adrian Klaver <adrian.klaver@gmail.com>
To: pgsql-sql@postgresql.org
Subject: Re: date range to set of dates expansion
Date: Thu, 19 Jan 2012 08:20:06 -0800
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Cc: Gary Stainburn <gary.stainburn@ringways.co.uk>
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	<201201191559.27698.gary.stainburn@ringways.co.uk>
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On Thursday, January 19, 2012 7:59:27 am Gary Stainburn wrote:
> The following code works in 8.4 but not 8.3.
> Anyone know why, or what I need to do to change it?
> 
> SELECT aid, asid,
>        date_range (asdate, afdate)::date AS asdate,
>        acomments
> FROM availability
> 
> In 8.4 it returns the expanded dataset as required. In 8.3 I get:
> 
> ERROR:  set-valued function called in context that cannot accept a set
> CONTEXT:  PL/pgSQL function "date_range" line 4 at RETURN NEXT

As to why it works in 8.4 vs 8.3

http://www.postgresql.org/docs/8.4/interactive/release-8-4.html

"Support set-returning functions in SELECT result lists even for functions that 
return their result via a tuplestore (Tom)

In particular, this means that functions written in PL/pgSQL and other PL 
languages can now be called this way.'

In 8.3- I believe you could only call it as

SELECT * from date_range (asdate, afdate)::date AS asdate;

> 
> Is there a way to use the integer only generate_series in 8.3 to generate
> dates by typecasting to/from integers?

-- 
Adrian Klaver
adrian.klaver@gmail.com